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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7175016c2837f6f474831c9c4fe35fd2b1718b0efd6f4d2a1c84026a72b55f07' 
  AND token = 'w+EAjAIOC15+sKRrP9XIlIVasyRPzQUfdtXoqvW3riQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}